Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Wavelengths, Energy Level Classifications, and Energy Levels for the Spectrum of Neutral Mercury


Edward B. Saloman


We have prepared a comprehensive critically evaluated compilation of the most accurate wavelength measurements for classified lines of neutral mercury (Hg I) for both the single isotope 198Hg and for mercury in its natural isotopic abundance. Data from 12 sources spanning the region 1849 to 40 050 are included for 198Hg. Data from 39 sources spanning the region 745 to 64 918 are included for the natural isotope mixture. Based on these line lists we have derived optimized values for the energy levels of neutral mercury for both 198Hg and the natural isotopic mixture. Tabular data for 105 classified lines and 60 energy levels are provided for 198Hg and 658 lines and 275 energy levels are provided for the natural isotopic mixture.
J. Phys. & Chem. Ref. Data (JPCRD) -


atomic energy levels, atomic spectra, atomic wave numbers, atomic wavelengths, energy level classifications, infrared wavelengths
Created November 15, 2018, Updated November 14, 2018